Abstract: It is especially benefit to bighead carp(Aristichthy nobilis)and silver carp(Hypopthalnaichthys molitrix)in the dike-pond ecosystem of the Zhujiang Delta, which is potimun to the growth of plankton. If the area of a pond is smaller, the kinds and quantities of plankton will not be stable, thus the dike-pond ecosystem has no selfcorrecting homeostasis. To acquire maximum sustained yield of bighead carp and silver carp, the dynamic equilibrium of population between plankton and fish must be kept by controlling the oxygen, fertilizer and forage artificially. In the light of the fact that the monthly amount of plankton and the average month produce rate of fish are synchronous, the author suggests that before the growth season of bighead carp and silver carp coming, the basic quantity of plankton must be increased by artificial controlling, in order to bring every pond's productivity into fully play.